I love Sketch. It's the go to tool for my web projects. But there are still a few glaringly obvious issues that need sorting out.

For me these are ;

The memory usage. Using Sketch really takes a large chunk of memory, especially when using large images.

The line-height issue. This has affected me on several occasions. It can be almost impossible to use a baseline grid.

File sizes. I may have missed something here but exported file sizes seem to be huge compared to exporting in Photoshop.